There are fears more lives will be lost to senseless youth violence as a community grieving the slaughter of two young boys pleads against revenge attacks.

Chol Achiek, 12, and Dau Akeng, 15, died after being mobbed while walking home in Melbourne's outer northwest on Saturday night.

The pair were ambushed by up to eight masked males armed with machetes and other bladed weapons.

Another boy who was walking with them after the group watched a basketball game together managed to escape the suspected gang members, who remain at large.

Chol's father, Chuti Ngong, joined hundreds of mourners at a vigil near the site of his son's death in Cobblebank on Tuesday.

He urged the community to prevent further violence on the streets, pleading for "more protection for everybody".

"I lost a very im

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